Associate Emails with Specific Deals

I am trying to run an export (or create filters) of deals but I need the deal's email which is within the contact properties. As of now, the email is not trasnferable to deals even if a contact and a deal are associated. This will be a great addition as once a customer is a deal, a lot of communications and activities happen and is important to be able to export information of the deal incluiding email addres and other contact properties for follow up purposes. 

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